Imaging Sensor Problem?

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Brian Gideon - 16 Nov 2006 21:29 GMT

All,

I have a Canon 300D which has worked quite well in the last 2 years.
Recently though I began noticing a thick curved strip starting in the
upper left corner of the image curving closer to the center as it works
its way down to the bottom left corner of the image. The strip is
between 100 and 200 pixels wide and appears in the exact same position
in all images. The strip has a slight lightening or over-exposing
effect. It is noticeable in some, but not all images. The aberration
appears with different lenses so I can conclude it must be something
with the camera and not the lens.

Has anyone else seen this before?

My best guess is a dirty or possibly defective sensor. Can someone
comment?

I have Adobe Photoshop Elements 4.0. Can I record a macro or something
that corrects the problem and apply it to all images?

Brian

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Todd H. - 16 Nov 2006 21:41 GMT

> All,
>
> I have a Canon 300D which has worked quite well in the last 2 years.

God I wish I could say the same about mine.

> Recently though I began noticing a thick curved strip starting in the
> upper left corner of the image curving closer to the center as it works
[quoted text clipped - 9 lines]
> My best guess is a dirty or possibly defective sensor. Can someone
> comment?

Hrmm. I can only offer that mine doesn't do that.

The flash system is a complete goddamn random function in terms of
exposure, but at least I don't have that problem. :-)

I concur with your suspicion about something in the sensor. Perhaps
the sense amplifiers have gotten "hot" or and are brightening up those
rows of pixels in comparison to others.

Sample images with various lens sizes might be interesting to throw
somewhere for folsk to wager a guess at.

--
Todd H.
http://www.toddh.net/

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bob crownfield - 16 Nov 2006 21:46 GMT

>> All,
>>
[quoted text clipped - 12 lines]
>>
>> Has anyone else seen this before?

an arc, on the right of the screen, darker,almost full frame hight.
it showed against light backgrounds.
Could not be cleaned, and was fixed only when fuji replaced the S2 Pro
with another.

>> My best guess is a dirty or possibly defective sensor. Can someone
>> comment?
[quoted text clipped - 14 lines]
> Todd H.
> http://www.toddh.net/

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Brian Gideon - 16 Nov 2006 22:13 GMT

> an arc, on the right of the screen, darker,almost full frame hight.
> it showed against light backgrounds.
> Could not be cleaned, and was fixed only when fuji replaced the S2 Pro
> with another.

Hmm...considering that my camera is not under warranty anymore that
doesn't exactly make me feel any better. But, at least I'm not alone :)

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bob crownfield - 17 Nov 2006 01:25 GMT

>> an arc, on the right of the screen, darker,almost full frame hight.
>> it showed against light backgrounds.
[quoted text clipped - 3 lines]
> Hmm...considering that my camera is not under warranty anymore that
> doesn't exactly make me feel any better. But, at least I'm not alone :)

it took fuji two tries.

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Wolfgang Weisselberg - 20 Nov 2006 18:33 GMT

> The flash system is a complete goddamn random function in terms of
> exposure

Don't focus and recompose. Read
http://photonotes.org/articles/eos-flash/

-Wolfgang

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Todd H. - 20 Nov 2006 19:19 GMT

> > The flash system is a complete goddamn random function in terms of
> > exposure
>
> Don't focus and recompose. Read
> http://photonotes.org/articles/eos-flash/

Oh, believe me I have. I've tried the techniques they suggest, and
it's still a fuggin crapshoot.

--
Todd H.
http://www.toddh.net/

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Wolfgang Weisselberg - 21 Nov 2006 13:28 GMT

>> > The flash system is a complete goddamn random function in terms of
>> > exposure

>> Don't focus and recompose. Read
>> http://photonotes.org/articles/eos-flash/

> Oh, believe me I have. I've tried the techniques they suggest, and
> it's still a fuggin crapshoot.

Hmmm. Maybe the EOS flash system is not for you, then.

-Wolfgang

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Brian Gideon - 21 Nov 2006 16:12 GMT

> The flash system is a complete goddamn random function in terms of
> exposure, but at least I don't have that problem. :-)

Well, for me it seems like I get consistently under exposed images
while using the flash. I've found that pressing the FEL on a gray
object and then recomposing helps, but unfortunately I almost always
forget to do that :)

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Wolfgang Weisselberg - 23 Nov 2006 21:35 GMT

>> The flash system is a complete goddamn random function in terms of
>> exposure, but at least I don't have that problem. :-)

> Well, for me it seems like I get consistently under exposed images
> while using the flash. I've found that pressing the FEL on a gray
> object and then recomposing helps, but unfortunately I almost always
> forget to do that :)

If it's consistenly underexposed, check that you don't have
set the flash power adjustments (both at the flash and in the
camera!) set to underexpose, and/or counter by upping them to
whatever value you feel comfortable with.

-Wolfgang

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